3
8
9
6
B
_L
IN
E
A
_L
IN
E
Page 12
PROFIBUS DP CONNECTION
Pin
Signal
Description
1
-
-
2
-
-
3
B line
+RxD/+TxD, level RS485
4
RTS
Request to send
5
GND
Ground (isolated)
6
+ 5V Bus 5V termination (isolated)
7
-
-
8
A line
-RxD/-TxD, level RS485
9
-
-
Housing Cable shield
Internally connected to protective
earth according to Profibus
specification
For connection to the Profibus Master, use a standard Profibus cable.
The typical impedance of the cable should be between 100 and
130 Ohms (f> 100 kHz). The cable capacity (measured between
conductor and conductor) should be less than 60 pF / m and the
minimum cable cross section should not be less than 0.22 mm2
In a Profibus-DP network, you can use either cable type A to type B
cable, depending on the required performance. The following table
summarizes the features of the cable to be used:
Specification
Type A Cable
Type B Cable
Impedance
from 135 to 165 ohm
(f = 3 – 20 MHz)
from 100 to 300 ohm
(f > 100 kHz)
Capacity
< 30 pF/m
< 60 pF/m
Resistance
< 110 ohm/km
-
Conductor cross
section
> 0,34 mm
2
> 0,22 mm
2
The following table shows the maximum length of the wires line with
cable type A and type B, function of the different communication
speed required:
Baud rate
(kbit/s)
9.6
19.2
187.5
500
1500
3000
6000 12000
Cable A lenght
(m)
1200
1200
1000
400
200
100
100
100
Cable B lenght
(m)
1200
1200
600
200
-
-
-
-
For a reliable operation of the Fieldbus, should be used a line ter-
mination at both ends.
In the case of multiple T200F instruments, use the line termination
at only one instrument.
For configuring the instrument, the GSD file is available (hms_1810.
gsd) that must be installed in the master.
Transmetteur de pesage T200F : Manuel d’utilisation et d’installation
